Nixpkgs module about flake-parts

[roberth]

Good idea. The root nixpkgs.* options could be permanent aliases for nixpkgsSets.pkgs or something.

[Atry]

I would just use https://github.com/NixOS/nixpkgs/blob/3b4e70e987a42792196294560a233d285b1c1d10/nixos/modules/misc/nixpkgs.nix

    ml-ops.inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      perSystem = { pkgs, system, ... }:
        {
          imports = [
            "${inputs.nixpkgs}/nixos/modules/misc/nixpkgs.nix"
          ];
          nixpkgs = {
            hostPlatform = system;
            
            
            # other options, e.g. 
            # config.allowUnfree = true;
          };
       };
    }

[srid]

Could we have more than one pkgs as a result? For, eg., native pkgs and a rosetta pkgs (on aarch64-darwin).

[roberth]

For Rosetta, you can already get a pkgs via getSystem and/or withSystem. Those will also give you access to your own packages for that system.
The feature still makes a lot of sense for having different versions of Nixpkgs, but for mixed-system and cross, it'd be better to use and improve the perSystem infrastructure.